A volunteer holds up tarps to protect children from the rain at the El Chaparral U.S.-Mexico border crossing, in Tijuana, Mexico, Wednesday, May 2, 2018, where the caravan of Central Americans seeking asylum in the United States have set up camp. Some migrants in the caravan of have started what will likely be a long process. About 28 were accepted for processing Monday and Tuesday by U.S. border inspectors at a San Diego crossing. (AP Photo/Hans-Maximo Musielik)
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